Question: Round the standard deviation & z value to two decimal places. Use a table for standard normal distribution & give the corresponding areas to four decimal places. Give your answer as a % rounded to two decimal places. 77% of L'.S. homes have a telephone answering device. In a random sample of 330 homes, what is the probability that more than 70 do not have an answering device? The probability that more than 70 do not have an answering device.